Just waiting to clog your engine’s raw water system.
Left to my own devices I could happily be a lazy guy, but that’s by no means a good thing to be when you’re in charge of a boat. When running charter boats that are in daily use, daily, weekly and monthly maintenance check lists are absolutely de rigeur to ensure that, random mechanical failure apart, the boat (and most particularly the engine) functions effectively.
There’s no consequential loss insurance available in this regard—blow the engine up through simple carelessness and that’s you out of the game. And it’s even more important when you’re in out of the way places.